Mormonism teaches that Jesus and Satan are spirit brothers and they both volunteered to be the Savior of mankind. Where in the Bible is this taught?

They base this teaching on Job 38:7, "When the morning stars sang together, And all the sons of God shouted for joy." The LDS prove this plan based on their own writings, not from the Bible. They quote from the Book of Abraham at Abraham 3:27 and from the Book of Moses at Moses 4:2. This story is explained here from their own books/writings: [Jesus Christ, Our Chosen Leader and Savior](https://www.churchofjesuschrist.org/study/manual/gospel-principles/chapter-3-jesus-christ-our-chosen-leader-and-savior?lang=eng) . >Our Father said, “Whom shall I send?” Jesus Christ, who was called Jehovah, said, “Here am I, send me” (Abraham 3:27). >Satan, who was called Lucifer, also came, saying, “Behold, here am I, send me, I will be thy son, and I will redeem all mankind, that one soul shall not be lost, and surely I will do it; wherefore give me thine honor” (Moses 4:1). >Jesus said, “Father, thy will be done, and the glory be thine forever” (Moses 4:2). So again, where in the Holy Bible is this plan explained?